Oh,Jack has broken his leg,we must ________ and take him to hospital at once.
题目
Oh,Jack has broken his leg,we must ________ and take him to hospital at once.
A.stop play football
B.stop to play football
C.stop playing football
答案
C.
stop doing sth停下来正在做的事情
stop to do停下来去做
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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